kernel/git - git - PowerEL Git System

Author	SHA1	Message	Date
Linus Torvalds	41f222e87a	Be marginally more careful about removing objects The git philosophy when it comes to disk accesses is "Laugh in the face of danger". Notably, since we never modify an existing object, we don't really care that deeply about flushing things to disk, since even if the machine crashes in the middle of a git operation, you can never really have lost any old work. At most, you'd need to figure out the proper heads (which git-fsck-objects can do for you) and re-do the operation. However, there's two exceptions to this: pruning and repacking. Those operations will actually _delete_ old objects that they know about in other ways (ie that they just repacked, or that they have found in other places). However, since they actually modify old state, we should thus be a bit more careful about them. If the machine crashes and the duplicate new objects haven't been flushed to disk, you can actually be in trouble. This is trivially stupid about it by calling "sync" before removing the objects. Not very smart, but we're talking about special operations than are usually done once a week if that. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Linus Torvalds	9106c097ad	Create object subdirectories on demand (phase II) This removes the unoptimization. The previous round does not mind missing fan-out directories, but still makes sure they exist, lest older versions choke on a repository created/packed by it. This round does not play that nicely anymore -- empty fan-out directories are not created by init-db, and will stay removed by prune-packed. The prune command also removes empty fan-out directories. Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Junio C Hamano	b8041fe4d8	Sparse-directory safety fix. This will be removed when merging the second phase of Linus' "Create object subdirectories on demand" change anyway, but the code to recreate the empty .git/objects/??/ directory was confused. Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Linus Torvalds	230f13225d	Create object subdirectories on demand This makes it possible to have a "sparse" git object subdirectory structure, something that has become much more attractive now that people use pack-files all the time. As a result of pack-files, a git object directory doesn't necessarily have any individual objects lying around, and in that case it's just wasting space to keep the empty first-level object directories around: on many filesystems the 256 empty directories will be aboue 1MB of diskspace. Even more importantly, after you re-pack a project that _used_ to be unpacked, you could be left with huge directories that no longer contain anything, but that waste space and take time to look through. With this change, "git prune-packed" can just do an rmdir() on the directories, and they'll get removed if empty, and re-created on demand. This patch also tries to fix up "write_sha1_from_fd()" to use the new common infrastructure for creating the object files, closing a hole where we might otherwise leave half-written objects in the object database. [jc: I unoptimized the part that really removes the fan-out directories to ease transition. init-db still wastes 1MB of diskspace to hold 256 empty fan-outs, and prune-packed rmdir()'s the grown but empty directories, but runs mkdir() immediately after that -- reducing the saving from 150KB to 146KB. These parts will be re-introduced when everybody has the on-demand capability.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Junio C Hamano	51890a64eb	Call prune-packed from "git prune" as well. Add -n (dryrun) flag to git-prune-packed, and call it from "git prune". Signed-off-by: Junio C Hamano <junkio@cox.net>	20 years ago
Junio C Hamano	54c6870ebf	Typofix: usage strings fix. The *_usage strings should not start with "usage: ", since the usage() function gives its own. Signed-off-by: Junio C Hamano <junkio@cox.net>	20 years ago
Linus Torvalds	2396ec85bd	Add "git-prune-packed" that removes objects that exist in a pack. This, together with "git repack" can be used to clean up unpacked git archives.	20 years ago